Hey. Had the same problem as I don't have a RO/DI unit either. I put Rowaphos in my canister filter and the diatoms went away almost immediately. Magic! Also, I've been buying RO water from Superstore. I figure it's probably not perfect but definitely better than the tap water!
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~Drew
10G Nano * 10G Sump * Deltec MCE 600 Skimmer * JBL Viper 150w MH * Zeovit * Vortech MP40W
Millions long for immortality who do not know what to do with themselves on a rainy Sunday afternoon. ~S. Ertz
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